2013 Buyer's Guide to Eyepieces
Posted 08 March 2013 - 12:04 PM
Between this and your "Best of Deep Sky" list, it's amazing that you have time for anything else! Keep up the good work!
Posted 08 March 2013 - 12:12 PM
Posted 23 March 2013 - 12:17 PM
Posted 11 April 2013 - 11:37 PM
I'll post instructions for how to add those columns to the spreadsheet tomorrow.
Posted 12 April 2013 - 10:24 AM
This new version has calculated columns for:
*true field in degrees (you can convert to minutes by multiplying by 60)
All you have to do is insert your telescope's focal length and f/ratio in the two top cells with red lettering.
*NOTE* this will not work with eyepieces that have a range of focal lengths or a range of magnifications. In those fields you will see errors.
Posted 25 April 2013 - 07:18 PM
I place all of that ahead of what he has recently told me, to establish his "bona fides" in the world of optics, both near, and at great distance. I had always told him from waaaaay back that I wanted a Contax 35mm, because they came with Zeiss lenses, which he always sang the praises of. I believe after that, in the camera world, Rodenstock and Sinar were his Choices...oh and Pentax, though their camera lenses aren't as highly prized as their telescope oculars.
Anyways, He told me just this last fall that Zeiss quality has fallen through the floor. I cannot remember if he said they were bought out, or what happened, and how long they've been sub par. I will contact him this evening or tomorrow to get his insight, but he told me that the people buying newer Zeiss lenses are wealthy impressionable amateurs. If true, it is indeed a shame that the greatest name in lenses has fallen away into the pack....yet still with winner's circle prices.
More to come as I learn, or others contribute.
Posted 10 June 2013 - 09:57 PM
The attached spreadsheet includes all non-discontinued after-market eyepieces currently available for sale by retailers.
The manufacturers catalogs are larger, but if no retailer is currently selling a particular eyepiece model, I did not include it on my chart.
All the normal information is included and prices are as I found them over the last month.
If I have inadvertently left off a brand or model, please send me a private message and a link to the website where I can find information. I can always update this.
Note that I purposely left off 0.965" eyepieces, Huygenian, Ramsden, and Super Ramsden eyepieces as I do not believe these would be of interest to people reading posts on Cloudy Nights.
I also left in the Pentax XW eyepieces as we just received word these are discontinued but there are a lot in the retail sales bins and will be for a while.
Posted 19 June 2013 - 08:07 AM
Posted 25 July 2013 - 05:17 PM
If it turns out to be really wonderful, I'll post. Otherwise, I might not get back to you.
Posted 31 July 2013 - 10:38 AM
Posted 31 July 2013 - 01:46 PM
They may be considered general use eyepieces. There is no specific name for the design that I know of. They may all be copies of the TeleVue Radian, which is now discontinued. I used the "planetary" moniker out of convenience.
A Plössl has 4 elements in 2 groups (2 doublets). There are at least 4 different configurations for these 4-element eyepieces, called Plössls or Super Plössls. Unfortunately, there are also some 5-element designs, in a 2:1:2 configuration that are also called Plössls or Super Plössls. They are not Plössls, but more closely resembling Erfles, and may be designed similarly to a WWII design of Carl Zeiss, called the Astroplanokular. And the actual symmetrical design we now call Plössls are not the original design (the "original" may have come from König, it has been argued).
Confusion reigns in design names. Partly, it's that many designers live a long time and have many designs. Albert König had 28 patents for different designs. At least 6 or 7 have been sold as telescope eyepieces, and many more used in binoculars. Eyepieces of 3, 4, 5 and 6 elements have been sold that were designed by König, so what is a König eyepiece?
Posted 31 July 2013 - 08:33 PM
Posted 06 August 2013 - 12:51 PM
No, not kidding. The UW80 eyepiece arrived from China on schedule -- seems fine to me for terrestrial viewing. Stars have to wait for clouds to dissipate (perhaps left over from tropical storm Flossie). Anyhow, relevance to the Guide is that it tells me I probably overpaid by $25 or so. Useful to know.
Please tell us that you are just kidding...?
Posted 11 August 2013 - 05:03 PM
So many resellers are selling BST (Barsta) eyepieces that I added those as well.